Calculation of divergent photon absorption in ultrathin films of a topological insulator

Abstract

We perform linear and non-linear photon absorption calculations in topological insulator ultra-thin films on a substrate. Due to the unique band structure of the coupled topological surface states, novel features are observed for suitable photon frequencies, including a divergent edge singularity in one-photon absorption process and a significantly enhancement in two-photon absorption process. The resonanct frequencies can be controlled by tuning the energy difference and coupling of the top and bottom surface states. Such unique linear and nonlinear optical properties make ultra-thin films of topological insulators promising material building blocks for tunable high-efficiency nanophotonic devices.

6 pages, 3 figures

References in corpus (10)

• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
• Exciton condensation and charge fractionalization in a topological insulator film
• Nonlinear optical probe of tunable surface electrons on a topological insulator
• Topological Change of the Fermi Surface in Low Density Rashba Gases: Application to Superconductivity
• Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
• Electron-phonon scattering in topological insulators
• Terahertz Kerr and Reflectivity Measurements on the Topological Insulator Bi2Se3
• Finite frequency magnetoelectric response of three dimensional Topological Insulators

Cited by in corpus (9)

• Quantum Anomalous Hall Effect in Magnetically Doped InAs/GaSb Quantum Wells
• Negative differential resistance and characteristic nonlinear electromagnetic response of a Topological Insulator
• Photocurrents in Bi2Se3: bulk versus surface, and injection versus shift currents
• Optical Conductivity of Topological Insulator Thin Films in a Quantizing Magnetic Field
• Strain-enhanced optical absorbance of topological insulator films
• Nonlinear Magneto-Optical and Magnetoelectric Phenomena in Topological Insulator Heterostructures
• Magneto-optical properties of topological insulator thin films with broken inversion symmetry
• Filtration and Extraction of Quantum States from Classical Inputs
• Topological luminophor Y2O3:Eu3++Ag with high electroluminescence performance